Description. Output Stage. 5k (10k) - + 5k (10k)

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1 THAT Corporation Low Noise, High Performance Audio Preamplifier IC FEATURES Low Noise: 1 nv/hz input noise (60dB gain) 34 nv/hz input noise (0dB gain) (1512) Low THD+N (full audio bandwidth): % 40dB gain 60dB gain Low Current: 6mA typ. Wide Bandwidth: G=100 High Slew Rate: 19 V/s Wide put Swing: ±13.3V on ±15V supplies Gain adjustable from 0 to >60dB with one external resistor Industry Standard Pinouts THAT 1510, 1512 APPLICATIONS Differential Low Noise Preamplifiers Differential Summing Amplifiers Differential Variable Gain Amplifiers Microphone Preamplifiers Moving-Coil Transducer Amplifiers Line Input Stages Audio Sonar Instrumentation The THAT 1510 and 1512 are high performance audio preamplifiers suitable for microphone preamp and bus summing applications. The ICs are available in a variety of packages and pin configurations, making them pin compatible with the Analog Devices SSM2019 and SSM2017 (discontinued), and the Texas Instruments INA217 and INA163. Gain for both parts is adjustable via one external resistor, making it possible to control gain over a wide range with a single-gang potentiometer. The 1510 gain equation is identical to that of the SSM 2019, reaching 6dB gain with a 10k resistor. The 1512 reaches 0dB gain with a 10k resistor. Because the 1512 exhibits significantly Description lower noise at lower gain settings, it is recommended over the 1510 for new designs. Designed from the ground up in THAT s complementary dielectric isolation process and including laser-trimmed Si-Chrome thin film resistors, the THAT 1510 and 1512 improve on existing integrated microphone preamps by offering lower noise at low gains, wider bandwidth, higher slew rate, lower distortion, and lower supply current. The parts feature internal ESD overload protection on all critical pins. In short, the THAT 1510 and 1512 provide superior performance in a popular format at an affordable price. V+ Input Stage R A put Stage (10k) (10k) - + Ref Pin Name DIP8 PKG SO8 SO16 SO14 RG V Ref V RG Table / 1512 pin assignments R G1 R G2 R B Part Type DIP8 SO8 SO14 SO P-U Inquire Inquire 1510S16-U V P-U 1512S8-U 1512S14-U Inquire Figure 1. THAT 1510 / 1512 Equivalent Circuit Diagram (THAT 1512 values shown in parentheses) Table 2. Ordering Information Rev. 00

2 Page 2 THAT 1510 / 1512 Audio Preamplifier IC SPECIFICATIONS 1 Absolute Maximum Ratings (T A = 25 C) Positive Supply Voltage (V CC ) +20 V Operating Temperature Range (T OP ) -40 to +85 C Negative Supply Voltage (V EE ) -20 V Storage Temperature Range (T ST ) -40 to +125 C put Short-Circuit Duration (t SH ) Continuous Junction Temperature (T J ) 150 C Lead Temp. (T LEAD ) (Soldering 10 sec) 260 C Recommended Operating Conditions Parameter Symbol Conditions Min Typ Max Units Positive Supply Voltage V CC V Negative Supply Voltage V EE V Electrical Characteristics Parameter Symbol Conditions Min Typ Max Min Typ Max Units Supply Current I CC,-I EE No signal ma V CC =-V EE = 20V ma Input Bias Current I B No signal; Either input A connected to GND Input Offset Current I B-OFF No signal A Offset Voltage put Stage put Offset Vos OO No Signal, V CM = mv Input Stage Input Offset Vos II V Total put Offset G=voltage gain G G G G mv Input Voltage Range Common Mode V IN-CM Common mode, all gains ± 13 ± 13 V Differential Mode V IN-UNBAL Unbalanced V One input to GND, 0dB gain Differential Gain G diff db Ref Input Voltage Range ± 8 ± 8 V Ref Input Impedance k Ref Input Gain to put 0 0 db Input Impedance Z IN-DIFF Differential 0dB gain M pf 20dB gain M pf 40dB gain M pf 60dB gain M pf Z IN-CM Common mode all gains M pf 1. All specifications are subject to change without notice. 2. Unless otherwise noted, V CC = +15V, V EE = -15V, T A =25 C,

3 Rev. 00 Page 3 Electrical Characteristics (Cont d) Parameter Symbol Conditions Min Typ Max Min Typ Max Units Common Mode Rejection CMR V CM =±10V;DCto60Hz 0 db gain db 20 db gain db 40 db gain db 60 db gain db Power Supply Rejection PSR V CC =-V EE ; ±5V to ±20V; DC to 60 Hz 0 db gain db 20 db gain db 40 db gain db 60 db gain db Total Harmonic Distortion THD+N V OUT = 7Vrms; R L = f = 1kHz; BW = 20 khz 0 db gain % 20 db gain % 40 db gain % 60 db gain % Equivalent Input Noise e n(out) f = 1kHz, 0 db gain nv/hz 20 db gain nv/hz 40 db gain nv/hz 60 db gain 1 1 nv/hz Input Current Noise i n 60 db gain pa/hz Noise Figure NF 60 db gain R S = db R S = db Slew Rate SR R L =2k C L =50pF V/s Bandwidth -3dB BW -3dB R L =2k C L =10pF 0 db gain MHz 20 db gain 8 9 MHz 40 db gain 7 7 MHz 60 db gain MHz put Gain Error G ER (OUT) f = 1kHz; R L =2k R G =infinite, G=0 db db R G = 1.1 k, G=20 db db R G = 101, G=40 db db R G =10, G=60 db db R G =10k, G=0 db d R G = 526.3, G=20 db db R G = 50.3, G=40 db db R G =5, G=60 db db put Voltage Swing V O R L =2k all gains ±13 ±13.3 ±13 ±13.3 V put Short Circuit Current I SC R L =0 ±17 ± 17 ma Minimum Resistive Load R Lmin 2 2 k Maximum Capacitive Load C Lmax pf k Gain Equation A V = k A V = R G R G

4 Page 4 THAT 1510 / 1512 Audio Preamplifier IC Applications Gain Setting A single external resistor (R G ) between the RG1 and RG2 pins is all that is needed to set the gain of the THAT 1510/1512, according to the formulae: for the 1510: A k V = or R G k for the 1512: A V = where A V is the voltage gain of the part. Either part may reach unity gain, but the value of R G required varies drastically between the two parts. For the 1510, gain is 0dB when R G is infinite (open); This is the minimum gain for the At infinite R G, the 1512 reaches -6dB gain; This is the minimum gain for the With R G =10k, the 1512 reaches 0dB gain. Overall gain accuracy depends on the tolerance of R G and the accuracy of the internal thin-film resistors connected to pins R G1 and R G2 in the 1510/1512 (R A &R B in Figure 1). These internal resistors have a typical initial accuracy (at room temperature) of ±0.5%, and are typically stable with temperature to within ±200 ppm/ C. Gain will drift with temperature based on the mismatch between the temperature coefficient of the external R G and that of the internal resistors R A &R B. For variable-gain applications where gain accuracy is important, THAT recommends using discrete, switched resistors for R G. Where continuous control R G is required, or where gain accuracy is less critical, a potentiometer may be used. In such applications, designers should take care in specifying the element construction to avoid excess noise. The potentiometer taper will set the circuit s characteristic of gain vs. pot rotation. Typically, reverse log (audio) taper elements offer the desired behavior in which gain increases with clockwise rotation (and lower values for R G ). See THAT Design Note 138 for a discussion of potentiometer taper and gain for the 1510 and 1512 compared to similar parts from other manufacturers. Noise Performance Both parts exhibit excellent voltage noise performance of ~1 nv/hz at high gains. With ~2 pa/hz current noise, they are optimized for relatively low source impedance applications, such as dynamic microphones with typically a few hundred ohm output impedances. But, because they have different internal gain structures, the 1510 has higher equivalent input noise at 0dB gain (~57 nv/hz) than the 1512, which runs 4.5 db lower at ~34 nv/hz. The unusual and superior topology of the THAT 1512 makes it s noise performance comparable to some of the better discrete designs currently available. Inputs Simple Configurations As shown in Figure 1, the 1510/1512 includes protection diodes at all pins except V+ and V-. These diodes reduce the likelihood that accidental electro- +15 C6 C1 C2 C3 47p R1 1k R2 1k RG RG2 RG1 V+ Ref V- U1 THAT 1510/1512 C9-15 Figure 2. Basic 1510 / 1512 Circuit

5 Rev. 00 Page 5 static discharge (ESD) or electrical over stress (EOS) will damage the ICs. Other diodes across the base-emitter junctions of the input transistors prevent excessive reverse biasing of these junctions (which would degrade the noise performance of the input devices). Other than the connection to the protection diodes, the 1510/1512 input pins are connected only to the bases of their respective input devices. For proper operation, the bases must be provided a source of dc bias that will maintain the inputs within the IC s input common-mode range. Two different schemes for this are shown in Figures 2 and 3. Figure 2 is simple, but its output will need to be ac-coupled to the next stage, particularly if R G is variable to allow gain adjustment. Figure 3 shows the addition of an integrator to servo the output offset. In this circuit, the output offset will depend on that of the external opamp U2, which may be small enough to avoid ac-coupling the output. Note that the values of R1 and R2 in these figures are small to minimize pickup of unwanted noise and interference. 1k is often used, which yields a differential input impedance of 2k, often considered to be ideal for many microphones. Phantom Power Phantom power is required for many condensor microphones. THAT recommends the circuit of Figure 4 when phantom power is included. R3 and R4 are used to limit the current that flows through the bridge circuit of D1 through D4 when C4 and C5 are discharged after being charged to 48V from the phantom voltage supply. R3 and R4 should be kept very small as shown in order to introduce minimal additional noise. C4 and C5 should be kept large to minimize high-pass filtering of the signal, and to avoid amplification of low-frequency current noise in the 1510/1512 input stage. Other manufacturers have recommended, and many pro audio products include, a zener diode arrangement connected to the bridge rectifier instead of the connection to V+ and V- as shown in Figure 4. While this arrangement does not keep the inputs inside the common mode range, it has the advantage of working even when the power is off. For further insights into this subject, see the Audio Engineering Society preprint The 48 Volt Phantom Menace, by Gary K. Hebert and Frank W. Thomas, presented at the 110th AES Convention. When using the more conventional zener diode approach, R3 and R4 must be made larger (e.g., 51) in order to limit peak currents enough to protect the zener diodes. In such cases, these resistors will limit the noise performance of the preamp. The ultimate floor is set by the impedance of the microphone, but any additional series resistance further degrades performance. Input Impedance and Line Input Configurations A higher common-mode input impedance may be desirable (compared with that of Figures 2 and 3), especially when a mic pre-amp input is configured to double as a line receiver. The circuit of Figure 4 also +15 C6 C1 C2 R1 1k RG RG2 V+ Ref RG1 V- U1 THAT 1510/1512 C8 R3 510k C3 47p R2 1k C9-15 U2 LF351 Figure / 1512 Circuit with put Offset Servo

6 Page 6 THAT 1510 / 1512 Audio Preamplifier IC +48V +15 R6 6k8 C1 C2 C3 47p R9 2k7 C4 47u R5 6k8 C5 47u R3 4R7 R4 4R7 D3 1N5819 D4 1N5819 D1 1N5819 D2 1N R1 10k RG R2 10k RG2 V+ Ref RG1 V- U1 THAT 1510/1512 C9-15 C6 Figure 4. Recommended 1510 / 1512 Circuit with Phantom Power accommodates this objective. In this circuit, R1 and R2 are increased to 10k, boosting the low-frequency common-mode input impedance from 500 to about 2k. A value of 2.7 k for R9 keeps the differential input impedance at 2 k without reducing the common-mode input impedance. A line input can then be added by connecting 5.1 k resistors from the line input s + and - input terminals to the positive and negative inputs, respectively, of the 1510/1512 of Figure 4. This increases the differential line input impedance to ~12.2 k, and results in a net attenuation (pad) of approximately 15.7 db between the line input and the output shown in Figure 4. Since, in many pro audio applications, the minimum pre-amp gain is 10 db, the pad effectively cancels out this minimum gain while adding an additional 6dB of attenuation, which allows the resulting line input to accommodate high line level signals. Reference Terminal The Ref pin provides a reference for the output signal, and is normally connected to analog ground. If necessary, the Ref pin can be used for offset correction or DC level shifting. A non-zero reference source resistance will reduce the IC s common-mode rejection (CMR) by the ratio of 10 k/r REF.

7 Rev. 00 Page 7 Package Information Initially, the THAT 1510 is available in a 16-pin (widebody) SOIC package, and the THAT 1512 is available in 8-pin SOIC and 14-pin SOIC packages. Samples of both parts are available in 8-pin DIP. Other version/package combinations will be considered based on customer demand. The package dimensions are shown in Figures 5, 6, 7, & 8, while pinouts are given in Table 1. All versions of the 1510 and 1512 are lead free and RoHS compliant. Material Declaration Data Sheets on the parts are available upon request. Figure 5. 8-pin DIP package outline Figure pin SO Wide package outline E F E F B C H 1 B C H D A G D A G ITEM A MILLIMETERS 4.80/4.98 INCHES 0.189/0.196 B 3.81/ /0.157 C D 5.80/ / / /0.018 E F 1.35/ /0.068 G 0.19/ / H 0.41/ /0.05 Figure 7. 8-pin SOIC package outline ITEM MILLIMETERS INCHES A B 8.56/ / / /0.157 C D E 5.80/ / / / F G 1.35/ / / / H 0.41/ /0.05 Figure pin SOIC package outline

8 Page 8 THAT 1510 / 1512 Audio Preamplifier IC Notes

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